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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6181ffd9e570652ec389abf16f1ad444af209a7b4c6ac451bbcb63e6b1800f58' 
  AND token = '6aMljSWT3pT9+R3ob8qKC73fR5Ota0Azr/wyaNiX/Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}